Don't have much time in TTs, but listen carefully to the suggestions for a tandem-axle trailer and the other towing-related bits. Towing things that heavy/large is something I do have much experience with and you can not take it lightly.
As far as "no such thing as too much tow vehicle", that is about right. As a young, single man I would tow at or beyond the towing book limit. As a married man with children, no way would I exceed book limits. Max for me is 75% of towing limit if family is on board.
